SDK开发静态库.a文件的合并

//生成的.a文件分为真机的和虚拟机，最后要合并一下
 lipo -create /Users/apple/Library/Developer/Xcode/DerivedData/YZLFlowObserve-aqdoiuyosvskbifbhrhfgkytsfab/Build/Products/Debug-iphoneos/libYZLFlowObserve.a /Users/apple/Library/Developer/Xcode/DerivedData/YZLFlowObserve-aqdoiuyosvskbifbhrhfgkytsfab/Build/Products/Debug-iphonesimulator/libYZLFlowObserve.a -output /Users/apple/Desktop/YZLFLow.a